store variables as one line in output file python

Question

I am trying to store three different variables(which are results from a for loop) as one line in a file. My entire code just in case you wondering what I am trying to do :

from Bio.PDB import *
from Bio import SeqIO
from glob import glob
parser = PDBParser(PERMISSIVE=True)
pdb_files = glob('/pdb_RF0001/*')

for fileName in pdb_files:
    structure_id = fileName.rsplit('/', 1)[1][:-4]
    structure = parser.get_structure(structure_id, fileName)
    model = structure[0]
    for residue1 in structure.get_residues():
        for residue2 in structure.get_residues():
            if residue1 != residue2:
                try:
                    distance = residue1['P'] - residue2['P']
                except KeyError:
                    continue
                f = open('%s.txt' % fileName, 'w')
                line = str(residue1)+','+str(residue2)+','+str(distance)
                f.write(line)
                f.close()
            break

Sample code for check :

f = open('%s.txt' % fileName, 'wb')
line = int(residue1)+','+int(residue)+','+float(distance)
f.write(line)
f.close()

How to store the three different variables from the line variable as one line in an output file?

Answer 1

使用f-string

line = f"{residue1}, {residue}, {distance}"

Answer 2

int(residue) is an integer, and float(distance) is a real number (specifically, a floating-point number, hence the " float "). Thus, in this line, you are trying to add numbers to strings:

line = int(residue1)+','+int(residue)+','+float(distance)

However, Python disallows this. What you probably want to do is convert residue1 , residue , and distance from (what I assume are) numbers to strings, like this:

line = str(residue1)+','+str(residue)+','+str(distance)

Answer 3

str.format()是 Python 中的字符串格式化方法之一

"{}, {}, {}".format("residue1", "residue", "distance")